.popup-overlay {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0, 0, 0, 0.6);
      justify-content: center;
      align-items: center;
      z-index: 999;
    }

    .popup {
      background: #1370b8;
      padding: 20px;
      max-width: 400px;
      width: 90%;
      border-radius: 10px;
      box-shadow: 0 0 10px rgba(0,0,0,0.3);
      position: relative;
      text-align: center;
    }

    .popup h2 {
      margin-top: 0;
    }

    .close-btn {
      position: absolute;
      top: 10px;
      right: 15px;
      font-size: 20px;
      cursor: pointer;
      color: #fff;
    }

    @media (max-width: 480px) {
      .popup {
        padding: 15px;
      }
      .popup h2 {
        font-size: 18px;
      }
      .popup p {
        font-size: 14px;
      }
    }